Electronic Journal of Differential Equations, Vol. 2012 (2012), No. 137, pp. 1-12. Title: Existence of solutions for mixed Volterra-Fredholm integral equations Authors: Asadollah Aghajani (Iran Univ. of Science and Tech., Tehran, Iran) Yaghoub Jalilian (Razi Univ., Kermanshah, Iran) Kishin Sadarangani (Univ. of Las Palmas de Gran Canaria, Spain) Abstract: In this article, we give some results concerning the continuity of the nonlinear Volterra and Fredholm integral operators on the space $L^{1}[0,\infty)$. Then by using the concept of measure of weak noncompactness, we prove an existence result for a functional integral equation which includes several classes of nonlinear integral equations. Our results extend some previous works. Submitted May 11, 2012. Published August 19, 2012. Math Subject Classifications: 45G10, 47H08. Key Words: Functional integral equation; fixed-point; Nemytski operator; measure of weak noncompactness; Caratheodory conditions.